From 00e9fc3827566c76a3e2f88bba53b971615bc286 Mon Sep 17 00:00:00 2001
From: llIllIllIllIllIllIllIllI <_@seol.pro>
Date: Sat, 13 Dec 2025 23:52:19 +0900
Subject: [PATCH] =?UTF-8?q?[20251213]=20BOJ=20/=20G5=20/=204=EC=99=80=207?=
 =?UTF-8?q?=20/=20=EC=84=A4=EC=A7=84=EC=98=81?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 "Seol-JY/202512/13 BOJ G5 4\354\231\200 7.md" | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 "Seol-JY/202512/13 BOJ G5 4\354\231\200 7.md"

diff --git "a/Seol-JY/202512/13 BOJ G5 4\354\231\200 7.md" "b/Seol-JY/202512/13 BOJ G5 4\354\231\200 7.md"
new file mode 100644
index 00000000..d544b00a
--- /dev/null
+++ "b/Seol-JY/202512/13 BOJ G5 4\354\231\200 7.md"	
@@ -0,0 +1,24 @@
+```java
+import java.io.*;
+
+public class Main {
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        long k = Long.parseLong(br.readLine().trim());
+        
+        long n = k + 1;
+        
+        StringBuilder sb = new StringBuilder();
+        while (n > 1) {
+            if (n % 2 == 0) {
+                sb.append('4');
+            } else {
+                sb.append('7');
+            }
+            n /= 2;
+        }
+        
+        System.out.println(sb.reverse().toString());
+    }
+}
+```